Electronics Forum | Sat Apr 17 17:08:22 EDT 2004 | finepitch
Russ has a hint by saying "too long of a soak at too high of a temp or being in reflow for too long/hot". I think the board should stay in the oven for 3-4 minutes, spending 60-90 seconds of which during reflow. in order to stay in the oven for 3 m
Electronics Forum | Fri Apr 23 22:42:13 EDT 2004 | ethercom
Thanks for the input Pete. I am using CP4 8x2 feeders. I have tried first with 0.7mm nozzle. Although pick up was OK, the camera saw a pregnant 0402 part which is as you know is 1mm by 0.5mm. I then moved to specially made 0.6mm nozzle to minimise th
Electronics Forum | Thu May 06 13:19:57 EDT 2004 | fmonette
Hi Rob, You might want to consider changing your current procedure. Components classified MSL 4 have only a 72 hours floor life at 30C/60%RH. Even if you consider the de-rating factor (table 7-1 in J-STD-033A), at 50% this maximum exposure time wil
Electronics Forum | Tue Jun 01 16:12:49 EDT 2004 | gregf912
The 10k rebuild does not need to be applied every 3-4 months as previosly stated. A cp machine that is running 100% of the time on a 24/7 basis will tack up 10k hours in 12.4 months. Now we all know that this is impossible due to parts shortages, pro
Electronics Forum | Thu May 13 19:41:17 EDT 2004 | johnww
Hi Everyone, I want to use LEDs in an enclosed box for edge lighting etched glass. There are 15 LEDs in a box and they are set up in 5 series of 3 LEDs. The LEDs are 3.5V 20Ma 8000mcd. I've worked out that I need an 82 ohm resistor for each series
Electronics Forum | Wed Jan 19 10:44:23 EST 2005 | russ
Although I have not personally run or programmed either the Universal or the Fuji to any great extent, I have worked in factories that have utilized each type. One had 4796 machines and the other used Fuji CP3, 4, 4-2, 6, 643. As an observer I am d
Electronics Forum | Mon Jun 28 22:44:13 EDT 2004 | davef
Q1: What is the most popular PCB finish for lead-free soldering ? A1: We'd guess ENIG Q2: Who drives the selection of the finish, assembler or designer ? A2: A tight circle of recrimination, blame letting, and other human ills that is primarily driv
Electronics Forum | Sat Aug 07 01:04:40 EDT 2004 | rsgupta
Why not.. You are always welcome. Firstly what I feel multicamera system (Top and Angled) AOI is always better than single Top camera system in terms of defect coverage. Secondly read On the fly inspection is much better than STOP and Go techniques.
Electronics Forum | Wed Jul 28 18:51:52 EDT 2004 | gregoryyork
Found problem many years ago by chemical extraction and IR analysis, produces alarming amounts of plasticizer from under cured or incorrect mix of hardener to liquid photoimageable solder resist. Problems this causes are endless and many things blame
Electronics Forum | Tue Aug 10 09:18:36 EDT 2004 | davef
Q1. What is a manufacturing resource planning? A1: http://computing-dictionary.thefreedictionary.com/Material%20Requirements%20Planning Q2. What is meant by TOC? A2: Tough to say, �Theory of Constraints�, maybe. If so, look here: http://www.goldra
